An updated version of the parsec model grid, denoted 1.2S, has been computed [1]} with a revised temperature vs. optical depth prescription based on sophisticated model atmospheres of low-mass stars [2]}, [3]}. These provide a better match to the observed properties of low-mass stars. However, they are not useful in the current situation as the modifications cover only masses of 0.7\(~{\rm M}_\odot \)  and lower.
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